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2015 | 128 | 3 | 353-357
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Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x Melt-Spun Alloys

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The Mössbauer spectroscopy and X-ray diffraction techniques have been used to investigate the effect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys Nd_{7.5}Pr_{2.5}Fe_{90-x}B_x (x=6, 8, 10) produced by melt-spinning technique. X-ray diffraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diffraction patterns of samples heat-treated at 700°C are indexed as Fe_{3}B, α -Fe, (NdPr)_{2}Fe_{14}B and Fe_{23}B_{6} phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are (NdPr)_{2}Fe_{14}B hard and t-Fe_{3}B soft magnetic phases while α -Fe and Nd_{23}Fe_{6} are detected as minor phases. The average internal magnetic field decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diffraction and Mössbauer spectroscopy results are in good agreement with each other.
Physical description
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